%0 Journal Article
%A Matthew J. Gursky
%A Andrea Malchiodi
%T A strong maximum principle for the Paneitz operator and a non-local flow for the $Q$-curvature
%J Journal of the European Mathematical Society
%D 2015
%P 2137-2173
%V 17
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4171/jems/553/
%R 10.4171/jems/553
%F JEMS_2015_17_9_a2